Characters analysis

I love this drama. Let's start with this also. I'm not sure how to even ask this question, I have no one else to talk about the characters' personality or the drama in general and on tik tok I wouldn't even dream on asking cause I have seen obsessive fans getting really mad crazy of Si-eun/ Suho ship and neglecting the actual bond they have with each other and the rest of the other characters.

This show somehow brings me comfort if it isn't much weird to say, and I wanted to write a fanfic about an OC that I made, but I wasn't sure how the characters would have canonically kinda reacted? I'm not sure if I'm gonna get jumped even here as well for just asking an opinion to other fans, so i deeply apologise for asking on this community cause I'm not sure if I can talk about fanfic in here.

My idea was kinda to make her already present in season.

And I'll just tell you how she is personality.

Her personality: she is kind-hearted, empathic, loyal to a fault (which i was told it can be a flaw too), she genuinely doesn't care about cruel people and she kinda feels like almost a wise person for her age (which is teen age) she is sarcastic a lot.

Her flaws : way to kind, way to selfless and struggle being selfish (at first than she stops) , anger issues, stubborn, she has a good heart ultimately and for the first two years she struggles with trusting people even before meeting the trio because she has ptsd...she is also a type of person that would absolutely not ask for help she might as well get hurt or sick and never tell because her view is that as long she is alive it's fine. She neglect herself and put people before herself, she is impatient too but it really depends on the occasion and its because she struggle with anxiety that she has to be perfect at everyone eyes and also she is deeply paranoid because she has to be perfect all times (unfortunately self inflicted trauma to fit people pleasing) , she has trust issue, high wariness.

But she can defend herself very well, although being slightly weak at first, she throws hands for sure, but she only acts kind when she trusts for the rest she acts stoic or just serious.

What do you all think? If it's okay, based on how they are portrayed in the kdrama.

Also, this is friendship! Not ship.